Pulverizing device and method



H. G. LYKKEN PULVERIZING DEVICE AND METHOD Filed NOV. 5, 1924 WM @f Patented Jan. 22,1929.

PATENT GFFICE.

HENRY G. LYKKEN, OF MINNEAPOLIS, MINNESOTA.

PUL'VERIZING DEVICE .AND METHOD.

Application led November The present invention relates to the treating of pulverized materials, such as by the conducting of the materials in. a finely d1 vided and suspended state and 1n a. more or less iuidal condition.

In the specific method and form of device selected to illustrate the invention, the pu 1- verized material is carried in suspension 1n a stream of air from the pulverizing means to the place of use or consumptlon. The 1nvention comprehends the treating of the material while being so conducted so that there may be an equalization or distribution of the rate of movement or flow of the material, thus avoiding concentrated currents and the carrying of the coarser with the finer vparticles to` the locus of use, and also includes the separating out of the coarser particles which may be collected and discharged for re-pulveriz1ng, if desired.

Among the objects of the invention are to provide a novel device for equalizing the flow of the iuidal material in a passage by the use of porous means, such as screens or the like, preferably removably located in the passage in the path of How of the material so that the rate of flow thereof may be partly checked to effect an equalization of the rate of How at all points of the stream or throughout the cross-sectional area thereof; to provide for separating out, preferably during the How checking, of the coarser particles, the particles, in a specific form of the device, being capable of moving by gravity over inclined screens to the'lower ends thereof where the particles may be collected in a chute and discharged to the exterior of the passage or returned to the pulverizing device for further reduction; to provide for a plurality of porous means, preferably spaced, for effecting the desired amount of checking and equalization; to provide the screens with openings greater in size than the size of the particles being carried by the stream of air; to provide means for removably and preferably slidably, supporting the screens and also providing the passage or chamber with an opening or slot through which the screens may be inserted or withdrawn; to provide for a closure for such opening; and to provide for such other objects, advantages and capabilities asmay later appear and which arev inherently possessed by the invention.

In the drawing, illustrating a form of device constructed in accordance with the invention, Figure 1 is a vertical section of the 3, 1924. Serial No. 747,486.

signed to feed the crushed material into the" opening 6 in the upper part of the grinding mechanism 7. The latter comprises suitable relatively movable grinding elements 8 and 9 suitably associated so that the material 10, fed into the grinding mechanism, may be acted upon by the members, preferably by a mulling action, and when ground and pulverized may be cast in the direction of the arrows 11 against an adjustable plate 12 as clearly shown in Figure 1 of the drawing.

An' is drawn in through an opening 13 and passes upwardly through the opening 6 and the material being discharged by the rotor ofthe pulverizer, the air t-hus acting to separate the finer particles from thematerial being` projected from the grinder rotor, and carryingthe same upwardly into an eX- pansion chamber 14. 4t. the same time the stream of air will pass through the clouds of pulverized material being reflected from the plate 12 and also separate therefrom the liner particles of pulverized material to be carried upwardly in the stream of air.

The chamber 14 has au inlet 15 communieating with the space or opening 6 in the upper .part of the grinding-and pulverizing mechanism and has an outlet 16 leading to a. point of use or consumption where a suitable suction or vacuum is produced for causing a drawing of the air through the chamber 14 and the opening 6 from the opening 13. Intermediate the inlet and outlet of the chamber may be located one or more screens 17 preferably7 of sheet materiall such as metal, provided with perforations or openings 18 of substantial size greater than the particles of material beingcarried upwardly by the stream of air. These sheets are preferably carried upon frames 19 movably and slidably supported upon supporting elements 20 suitably secured to the side walls of the chamber 14. These screens are preferably located transversely of the path of flow of the air and pulverized material and substantially completely across the space in the chamber 14. They are also preferably inclined with lower#eumls thereof located in an opening 22 formed inofneor 'the walljs,:23",oi` thegchamber; The' opening 22 is preferablynormally closed by a cap' or closure member 24 having flanges adapted to have a sliding tit with the flangesi26 surroululing the opening 22. The

Vcap 24 will perform the double function ot' The lower end of the chute extends into an outlet passage 30 having an adjustable plate or trap door 31 so located that the suction produced in the chamber 14 will not be broken y the opening 3() but will permit the downward flow ot the accumulated particles of material so the same mav be discharged into the chamber of the grinding and pulverizing mechanism and again acted. upon for further reduction.

At the upper end of the chamber 14 may be provided a door 34 of any suitable form for giving access into the chamber. Atthe lower end of the chamber is provided a safety gate 32 supported upon a rod 33 near the feeding roller 5 such that if any non-crushable matter should be forced through the assage from chamber 4 to the opening 6 y the crusher roller 5, the safety gate 32 may yield and permit the passage of the non-crushable material.

In operation, the material being ground and pulverized is cast in the direct-ion of the arrows 11 across the upwardly moving stream of air yso that the latter may separate out of the material fine particles of pulverized material and carry the same upwardly in suspended condition. The material cast upon the plate 12 will be reicctcd into the stream of air and the latter will further remove articles of material and carr the same u wardly in suspended state. If no provision were made for equalizing the rate of flow of the material throughout. the width of the chamber 14, concentrated and local currents would occur so that the coarser material with the iner material would he carried through these currents into the outlet 16 and to the place of use. By providing the perforated screens in the path. of movement of the air and suspended material, a checking effect is produced so that the stream will have an opportunity to be equalized so that the flow thereof at all points will be equal and evenly distributed. At the ksame time as the air and suspended particles passthrough the perorationsjl'otfthe screeiis,ltl1e heavier parthe openings 27 and into the chute 28. These heavier particles will accumulate in the passage Si() and he discharged into the )ulvcrizing device. 'lhe air and liner particles will then pass, evenly distributed` into the outlet 16 and to the consuming means.

lVhile 1 have herein descrihwlland upon the drawing shown one 'form ot' device for carrying out the invention.v it is to be understood that the invention comprehends other constructions. details and arrangements of parts without departing from the spirit thereof.

Having thus described my invention, I claim:

l. A pulverizine: apparatus comprising a pulverizing chamber provided with pulverizmg means, an ex ansion chamber connected with the pulverizmg chamber so that the pnlverized material may be drawn thercinto, a screen positioned in the expansion chamber a substantial distance from the inlet opening of said chamber, said screen being extended approximately across the entire cross scetional area of the expansion chamber so as to equalize movement of the pulverized material through the last mentioned chamber.

2. A pulverizing apparatus comprising a pulverizing chamber having pulverizing means therein, an expansion chamber connected with the pulverizing chamber so that the pulverized material may be drawn thereinto. a screen positioned-in the expansion chamber a substantial distance from the inlet opening of said chamber, said screen extend ing approximately across the entire cross sectional area of said expansion chamber so as to equalize movement of the pulverized material therethrough, and means adjacent one edge of the screen providing a shielded outlet for discharging into' the pulverizing chamber the coarser particles which drop out of the stream of pulverized material.

v3. A pulverizing apparatus comprising a chamber provided with pulverizing means, an expansion chamber connected with the pulverizing chamber so that the pulverized material may be drawn thereinto, an inclined screen positioned in the expansion chamber a substantial distance from the inlet opening thereof, said screen extending approximately across the entire area of the expansion chamber so as to equalize movement of the pulverized material therethrough, the lower portion of said screen being provided with discharge openings for the coarser particles which drop out of the stream of pulverized material, and means for directing said coarser particles to the pulverizing chamber.

4. A pulverizlng apparatus comprising a pulverizing chamber, an expansion chamber connected with' the pulverizing chamber so within thatpulverized inat'erialmay be drawn from the pulverizing chamber into the'expansion chamber, a plurality of inclinedscreens positioned in the expansion chamber a substantial distance from the inlet opening of said chamber, said screens extending approximately across the entire cross sectional area of said expansion chamber so as to equalize movement of thefpulverized material therethrough, and means at the lower ends of said screens for directing into the pulverizi'ng chamber the coarser particles which drop out of the stream ot pulverized material.

5. A pulverizing apparatus comprising a pulverizingchamber, an expansion chamber connected therewith so that pulverized material may be drawn from the pulverizing chamber into the expansion chamber, a plurality of spaced apart screens positioned the expansion chamber a substantiall distance from the inlet opening thereof, said screens extending approximately across the entire cross'sectional areaV of the expansion chamber so as to equalize movement of theY pulverized material through the last mentioned chamber, frames 'for said screens, and

means in the expansion chamber for removably supporting the screens, said chamber having an opening through which the iframes may be removed or inserted in place.

6. Apulverizing apparatus comprisino' a pulverizing chamber, an expansion cham )er connected therewith so that ulverized material may be drawn from t e pulverizing chamber .into the expansion chamber a plurality of spaced screens located within the expansion chamber a substantial distance from the inlet opening'of said chamber and extending approximately across the entire cross sectional area of said expansion chamber, so as to check and deiiect the stream of pulverized material and thereby ei'ect an equal iiow of the stream in said expansion chamber, said screens comprising frames and porous sheets carried bythe frames, means /nlct opening,

in the ex ansion chamber for slidably porting t e frames, opening through which the screens may' be slid into and out of place in the chamber, and means for closing said opening.'

y?. A pulverizing apparatus comprising a pulverizing chamber provided with an air an adjustable deiiecting plate mounted adjacent said opening, an expansion chamber chamber so that pulverized material may be drawn ,/heieinto fromsaid pulverizing chamber, a /iscreen positioned 1n the expansion chamber` a substantial distance from the' inlet opening thereof and extending approximately across the entire cross sectional area of said chamber, a chute adjacent said screen to receive coarser particles which may pass said screen, said chute having an outlet passa e suppositioned to direct said particles into said pulverizing chamber so that pulverized material may be drawn by suction thereinto fromthe pulverizing chamber, a screen positioned in the'expansion chamber a substantial distance from the inlet opening of said expansion chamber, said screenextending approximately across the entire cross sectional area of said chamber, a chute for directing the heavier particles of pulverized material back to said pulverzing chamber, and means associated with said chute for permitting downward' flow of the accumulated heavier particles to the pulverizing chamber and preventing the breaking of the suction produced in said expansion chamber.

Inv witness whereof, I hereunto subscribe my name to this specification.

I HENRY G. LYKKEN;

directing pu1,

said chamber having an connected with the pulverizing 

